| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| jmh_desiderio | "Good day, i would like to ask on how did you manage to measure the nutrient uptake of a plant. i am currently doing a thesis for the measurement of..." | Read more » | about 3 years ago | |||
| Aleksi12358 | "Lamotte produces hydroponic test kit but it is over 300$ for 4 nutrients. Problem with test meant for soil is that they dont show results as ppm or..." | Read more » | almost 6 years ago | |||
| Aleksi12358 | "That is so good! I will order Public lab spectrometer or parts for it from somewhere and few photometer reagents so that I can do some tests so tha..." | Read more » | almost 6 years ago | |||
| warren | "Yes definitely the diy spectrometers on this site can have their range narrowly selected. See SpectralWorkbench.org for some examples! " | Read more » | almost 6 years ago | |||
| Aleksi12358 | "So it is possible to use spectrometer as colorimeter. Is it possible to choose to read narrow band of spectrum with Public lab spectrometer softwa..." | Read more » | almost 6 years ago | |||
| Aleksi12358 | "Thank you for links. I will contact person who designed that automatic water tester and ask few question about accuracy of readings and use of diff..." | Read more » | almost 6 years ago | |||
| Aleksi12358 | "Thank you for suggestion. I will look into it. " | Read more » | almost 6 years ago | |||
| warren | "Also Markos, from the spectrometry mailing list, chimed in with:grinning: Hi, I apologize for sending here a reply to the question proposed at: ..." | Read more » | almost 6 years ago | |||
| Ag8n | "The public lab instrument will cover a part of the NIR. Unless you can find very cheap used FTIR, the cost of the instrument will far exceed your ..." | Read more » | almost 6 years ago | |||
| warren | "And in case there are updates from others, let's see if @Frikkie or @winsorje have something to add? " | Read more » | almost 6 years ago | |||
| warren | "Maybe @fez who asked this would be interested too: https://publiclab.org/questions/fez/02-01-2017/diy-methods-for-nitrate-detection-in-food " | Read more » | almost 6 years ago | |||
| warren | "Hi, just for starters there are a couple interesting projects related to nitrate detection here: https://publiclab.org/tag/nitrate There's also t..." | Read more » | almost 6 years ago | |||
| Ag8n | "I have very little experience with soil testing. So the local extension agent was called. He suggested the lamotte NPK test kits. One that will ..." | Read more » | almost 6 years ago | |||
| Aleksi12358 | "Hello. I would like to measure every plant nutrient from macro to micro but I think macro nutrients(nitrogen, potassium, phosphorus, sulfur, calci..." | Read more » | almost 6 years ago | |||
| warren | "Hi, which nutrients are you hoping to measure? " | Read more » | almost 6 years ago | |||
| warren | "We're starting to compile a lot of different sensors and testing methods here -- could be of help! https://publiclab.org/wiki/water-sensors " | Read more » | over 6 years ago | |||
| fieldlab | "Yes, a good question @warren - possibly not, and I'm not sure how to find out, apart from buying a whole lot of cheap cell phones. I'll keep thinki..." | Read more » | almost 8 years ago | |||
| warren | "Hmm, interesting! Would a cell phone screen be a really consistent spectrum? I wonder how much variability there is in manufacturing. " | Read more » | almost 8 years ago | |||
| fieldlab | "Thanks for your reply @warren. There is pretty good discussion going on about this concept on hackaday for Pb detection in drinking water a la Flin..." | Read more » | almost 8 years ago | |||
| warren | "Hmm, interesting. I don't know much about paper assays, but this kit available online says: Smallest Increment: Steps: 0, 0.15, 0.3, 1, 1.5, 3 ppm..." | Read more » | almost 8 years ago |